Protective layer for the protection of a component against...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 30/00 (2006.01) C23C 14/16 (2006.01) C23C 24/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2542763

The invention relates to a protective layer for the protection of a component against corrosion and oxidation at elevated temperatures. Previously known protective layers with a high Al and/or Cr content, which are additionally reinforced with Re, form brittle phases that embrittle further during use due to the influence of carbon. The inventive protective layer is composed of 0.5 to 2 percent rhenium, 24 to 26 percent cobalt, 15 to 21 percent chromium, 9 to 11.5 percent aluminum, 0.05 to 0.7 percent yttrium and/or at least one equivalent metal from the group comprising scandium and the rare earth elements, 0 to 1 percent ruthenium, the remainder consisting of cobalt and/or nickel and production-related impurities. Said protective layer is subject to hardly any embrittlement resulting from Cr/Re precipitations.

L'invention concerne une couche de protection destinée à protéger un composant contre la corrosion et l'oxydation à des températures élevées. Les couches de protection connues qui présentent une teneur élevée en Al et/ou en Cr et qui sont en outre renforcées par du Re forment des phases cassantes qui, sous l'action du carbone, deviennent encore plus fragiles, lors de l'utilisation. La couche de protection selon l'invention présente la composition suivante : entre 0,5 et 2 % de rhénium ; entre 24 et 26 % de cobalt ; entre 15 et 21 % de chrome ; entre 9 et 11,5 % d'aluminium ; entre 0,05 et 0,7 % d'yttrium et/ou d'au moins un métal équivalent issu du groupe rassemblant le scandium et les éléments des terres rares ; entre 0 et 1 % de ruthénium ; des résidus de cobalt et/ou de nickel ; ainsi que des impuretés qui sont liées à la production. Ladite couche de protection ne présente qu'une très faible tendance à la fragilité qui est due à des séparations Cr/Re.

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